In Scala, how does one write a class with a constructor, not all of whose arguments are class member

Posted by user318816 on Stack Overflow See other posts from Stack Overflow or by user318816
Published on 2010-04-16T19:21:48Z Indexed on 2010/04/16 19:23 UTC
Read the original article Hit count: 234

Filed under:

scala

|

constructor

I want to write class whose constructor takes two parameters, but the arguments are not actually members of the class. e.g.

class P(V1:Int, V2:Int) {
   val set = Set(V1, V2)
}

Having constructed the 'set', I don't actually care about V1 and V2. Is there a way of expressing this in Scala ?

© Stack Overflow or respective owner

Related posts about scala

ensime scala errors (class scala.Array not found, object scala not found)

as seen on Stack Overflow - Search for 'Stack Overflow'
I've installed ensime according to the README.md file, however, I get errors in the inferior-ensime-server buffer with the following: INFO: Fatal Error: scala.tools.nsc.MissingRequirementError: object scala not found. scala.tools.nsc.MissingRequirementError: object scala not found. at scala… >>> More
infinite loop shutting down ensime

as seen on Stack Overflow - Search for 'Stack Overflow'
When I run M-X ensime-disconnect I get the following forever: string matching regex `\"((?:[^\"\\]|\\.)*)\"' expected but `^@' found and I see this exception when I use C-c C-c Uncaught exception in com.ensime.server.SocketHandler@769aba32 java.net.SocketException: Broken pipe at java… >>> More
How to resolve java.nio.charset.UnmappableCharacterException in Scala 2.8.0?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using Scala 2.8.0 and trying to read pipe delimited file like in code snipped below: object Main { def main(args: Array[String]) :Unit = { if (args.length > 0) { val lines = scala.io.Source.fromPath("QUICK!LRU-2009-11-15.psv") for (line <-lines) print(line) } … >>> More
Question on Scala Closure (From "Programming in Scala")

as seen on Stack Overflow - Search for 'Stack Overflow'
I don't understand why authors said that Code Listing 9.1 from "Programming in Scala" use closure. In chapter 9, they show how to refactor code into more less duplicated form, from this original code: object FileMatcher { private def filesHere = (new java.io.File(".")).listFiles def filesEnding(query:… >>> More
Common idiom in Java to Scala, traverse/Iterate Java list into Scala list

as seen on Stack Overflow - Search for 'Stack Overflow'
I am processing a XML document and iterating through nodes. I want to iterate through the nodes and build a new List of some type. How would I do this with Scala: Here is my XML traverse code: def findClassRef(xmlNode: Elem) = { xmlNode\"classDef" foreach { (entry) => val name… >>> More

Related posts about constructor

Constructor with less arguments from a constructor

as seen on Stack Overflow - Search for 'Stack Overflow'
I have Constructor Tree(int a, int b, int c) and second Constructor Tree(int a, int b, int c, String s). How to load second constructor from first just to save writing all the logics ? I thought about something like this but it gives me 'null' object. public Tree(int a, int b, int c){ Tree t1… >>> More
How do I get a PHP class constructor to call its parent's parent's constructor

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to have a class constructor in PHP call its parent's parent's (grandparent?) constructor without calling the parent constructor. // main class that everything inherits class Grandpa { public function __construct() { } } class Papa extends Grandpa { public function __construct() … >>> More
Private constructor and public parameter constructor -C#

as seen on Stack Overflow - Search for 'Stack Overflow'
I heard that private constructor prevent object creation from outside world. When i have a code public class Product { public string Name { get;set;} public double Price {get;set;} Product() { } public Product(string _name,double _price) { } } here still i can declare… >>> More
How to XML configure Spring bean for constructor injection when bean has varargs constructor

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a way to write a Spring bean in XML so that it uses constructor injection when that constructor has a varargs parameter type? IE, is there a way to specify an array the way you can specify a list? For instance: class MyClass { MyClass(String... args) { // rest omitted } } >>> More
Empty constructor or no constructor

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I think it is not mandatory to have a default constructor in a class (C#). So in that situation shall I have a empty constructor in the class or I can skip it? Is it a best practice to have a default empty constructor? Class test { test() { } ...... } or Class test { … >>> More